Generally speaking, there are four main areas of change:
Semantic markup, including the following tags:
<section>
<article>
<header>
<footer>
<nav>
<aside>
<hgroup>
This also applies to tag changes <doctype>, <html>and <meta>, as well as link links (rel attribute on a tag <a>).
Improved support for forms - mostly semantic additions to input types, and a few neat things, such as field autofocus and placeholder text.
- <video>, <audio> <canvas>. <video> <audio> ; <canvas> JavaScript.
DOM, JS - navigator.geolocation, window.localStorage ( ), window.applicationCache ( ), - ( JavaScript )
HTML - Safari, <video> - ( ), IE .
HTML5, , , HTML5